How much concentrated 18m sulfuric acid is needed to prepare 250ml of a 6.0m solution?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?

One similarity and one difference between an element and a mixture of elements